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Flatlander · January 4th, 2008, 05:33

Well a new guy here just recently purchased a slightly used upgraded CA M4 and within approx. 100 rounds it locks up on him.

Important background on the internals:

-Prom. SP120 spring
-Guarder bearing piston head (polycarb or AL, unknown)
-Deep fire metal nozzle
-Systema bearing spring guide
-*Possible* systema RED piston
-Gun and all the parts very new and most likely less than 3000rnds

So while firing the gun jams. He clears the jam with the cleaning/unjamming tool. Fires some more and it jams again and the mechbox locks up. He disassembles it himself a bit and is able to look into the cylinder port hole and sees red chucks inside as well as the part of the RED piston in the rearward position (ie. locked up w/ spring compressed).

It was not mentioned if the piston was also upgraded and as far as I know only systema makes a red piston, correct? And I've read these should be avoided at all costs, correct?

Also, it wasn't mentioned if the piston head was aluminum or polycarbonate. I was able to find a guarder bearing piston head in aluminum and am not sure if a polycarb exists? I know aluminum heads should NOT be used in a V2.

Anyways, I'm not completely aware of the extent of the damage as I have not yet personally seen it. He's probably going to be bringing it around for me to have a look at pretty soon but from talking with him it sounds as if the front of the piston exploded and then locked up the mechbox. So, does anyone have any ideas of WHY this happened?

-Spring to heavy?
-Poor parts choice?
-Improper installment?
-Combination of the above?
-Did the jamming have anything to do with the failure?
-Other?

This guys is brand new into airsoft and this was his first gun so I'm hoping this can be solved and is a relatively easy and cheap fix! I'm no gundoc so hints on what I should be looking for or other possible damaged areas. I don't plan to fix it for him unless it's a simple piston replacement.

Also, what type of piston should he get? I'll probably convince him to go down to a sp110 spring. I've heard good things about stock TM pistons. The piston head may also have to be replaced; suggestions?

Thanks guys.

EDIT: I'll update after I've opened up the mechbox.

January 4th, 2008, 05:33	#1
Flatlander Trader rating Join Date: Mar 2007 Location: Edmonton	V2 mehcbox piston problems. Well a new guy here just recently purchased a slightly used upgraded CA M4 and within approx. 100 rounds it locks up on him. Important background on the internals: -Prom. SP120 spring -Guarder bearing piston head (polycarb or AL, unknown) -Deep fire metal nozzle -Systema bearing spring guide -Possible systema RED piston -Gun and all the parts very new and most likely less than 3000rnds So while firing the gun jams. He clears the jam with the cleaning/unjamming tool. Fires some more and it jams again and the mechbox locks up. He disassembles it himself a bit and is able to look into the cylinder port hole and sees red chucks inside as well as the part of the RED piston in the rearward position (ie. locked up w/ spring compressed). It was not mentioned if the piston was also upgraded and as far as I know only systema makes a red piston, correct? And I've read these should be avoided at all costs, correct? Also, it wasn't mentioned if the piston head was aluminum or polycarbonate. I was able to find a guarder bearing piston head in aluminum and am not sure if a polycarb exists? I know aluminum heads should NOT be used in a V2. Anyways, I'm not completely aware of the extent of the damage as I have not yet personally seen it. He's probably going to be bringing it around for me to have a look at pretty soon but from talking with him it sounds as if the front of the piston exploded and then locked up the mechbox. So, does anyone have any ideas of WHY this happened? -Spring to heavy? -Poor parts choice? -Improper installment? -Combination of the above? -Did the jamming have anything to do with the failure? -Other? This guys is brand new into airsoft and this was his first gun so I'm hoping this can be solved and is a relatively easy and cheap fix! I'm no gundoc so hints on what I should be looking for or other possible damaged areas. I don't plan to fix it for him unless it's a simple piston replacement. Also, what type of piston should he get? I'll probably convince him to go down to a sp110 spring. I've heard good things about stock TM pistons. The piston head may also have to be replaced; suggestions? Thanks guys. EDIT: I'll update after I've opened up the mechbox.